The Collaborative International Dictionary of English v.0.48:

Suppletive \Sup"ple*tive\, Suppletory \Sup"ple*to*ry\, a. [Cf.
   F. suppl['e]tif, LL. suppletivus, from L. supplere,
   suppletum, to fill up. See Supply.]
   Supplying deficiencies; supplementary; as, a suppletory oath.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Suppletory \Sup"ple*to*ry\, n.; pl. Suppletories.
   That which is to supply what is wanted.
   [1913 Webster]

         Invent suppletories to excuse an evil man. --Jer.
                                                  Taylor.
   [1913 Webster]